UPDATE: As if 12:45 p.m. on April 7, the Silver Alert for Delph has been cancelled. 

ORIGINAL: PORTER COUNTY, Ind. -- The Porter County Sheriff's Department reports they're investigating the disappearance of 15-year-old Austin Delph.

Delph is described as a white male, 5 feet 10 inches tall, 150 pounds, blonde hair with blue eyes, and was last seen wearing a red sweatshirt, black sweatpants, and red shoes.

Delph is missing out from Valparaiso and was last seen on March 22 around 8:30 p.m.

He is believed to be in extreme danger and may need medical assistance.

If you have any information on Delph's whereabouts, you're asked to contact the Porter County Sheriff’s Department at (219) 477-3170 or 911.